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F7
Which way do losses go?
Motoring divides by η, generating multiplies: the power-flow arrows.
Lesson: The mechanics of drives
Try it: which way do losses go?
Motoring (lifting)
Generating (lowering)
Grid
Drive + motor
Load
heat 2.16 kW
14.42 kW
12.26 kW
Mechanical power
12.26 kW
Efficiency η
0.85
Drawn from the grid
14.42 kW
Losses
2.16 kW
P_elec = P_mech / η
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Starting a motor and its load
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Ladder logic starter